Combination Vehicles Practice Test | Alabama 2025 #2

Train for FREE online with our Alabama CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a AL combination license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

Number of Question 20

Passing Score 16

Number of Tests 20

1 . After finishing a pre-trip inspection, you should:

Close the service line valve.

Remove the service line valve.

Leave the emergency line valve open.

Leave the rear shut-off valves open.

Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves to listen for escaping air. Close both shut-off valves before beginning to drive.

2 . When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:

In the same way as they would be in a vehicle without ABS.

As the vehicle is placed in neutral.

With the hand brake.

When driving a vehicle with ABS, you should brake in the same manner as you would in a vehicle without ABS.

3 . During a trip, the ____ should be open.

Rear service line shut-off valve

Rear supply line shut-off valve

Inner shut-off valves

When starting a trip, be sure that all shut-off valves are in the open position, except for the last valves on the rear trailer. It is important that air reaches the brakes on all trailers and that it is not able to escape from the back of the vehicle.

4 . When coupling a trailer:

Make sure to couple matching glad hands.

Any glad hand can be connected to any other glad hand.

It is best to leave one glad hand unattached.

Only one set of glad hands should be connected.

When coupling, make sure you couple matching glad hands. They are often color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.

5 . Rollovers happen when drivers:

Turn too quickly.

Do not driving fast enough.

Pay attention to the road.

Drive illegally.

A rollover happens as a result of a driver taking a turn at too high a speed. Be sure to take turns and curves safely and slowly.

6 . Look into the back of the fifth wheel:

While testing your air brakes.

If your vehicle begins to skid.

When inspecting a coupling.

While inspecting a coupling, you should go under the trailer and look into the back of the fifth wheel. Ensure that the fifth wheel jaws are secured around the shank of the kingpin.

7 . To prevent a rollover, a driver should:

Keep cargo low.

Place cargo high.

Keep cargo loose.

Turn quickly.

Rollovers can happen when a combination vehicle is turned too quickly. To help prevent the risk of rollover, it is important to keep the vehicle's center of gravity low by loading cargo as close to the ground as possible.

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2025 Alabama | Frequently Asked Questions

To acquire a CDL Tank endorsement in Alabama, you must first possess a Commercial Driver's License (CDL). Then, you need to pass the Tank Vehicle Endorsement Knowledge test, which covers the proper handling and driving of tank vehicles. Studying the Alabama CDL Manual can assist in preparing for this test. After passing, you will receive the Tank endorsement on your CDL.

To obtain a CDL Tank license, it's essential to first have a Commercial Driver's License (CDL). You must then pass the Tank Vehicle Endorsement Knowledge test, which focuses on the correct handling and driving of tank vehicles. It's important to thoroughly study the Alabama CDL Manual to prepare for this test. Upon passing, you'll receive your CDL Tank endorsement.

While Alabama does not mandate specific training or experience for a CDL Tank endorsement, you must pass the Tank Vehicle Endorsement Knowledge test. This test covers the handling and driving of tank vehicles. Studying the Alabama CDL Manual can help prepare for this test. Practical experience or training could be beneficial, but it is not a legal requirement.

Yes, to obtain a CDL Tank endorsement in Alabama, you need to pass the Tank Vehicle Endorsement Knowledge test. This test is in addition to the general CDL test. It covers specific knowledge related to the safe operation and handling of tank vehicles. Studying the Alabama CDL Manual can help you prepare for this exam.

The written test for the CDL Tank endorsement in Alabama covers several topics related to tank vehicles. These include inspecting tank vehicles, driving tank vehicles, and safe handling of liquid cargo. It also includes understanding the high center of gravity in tank vehicles, checking for leaks, and emergency procedures. The Alabama CDL Manual provides detailed information on these subjects.

During the CDL Tank endorsement assessment, skills such as safe driving techniques, proper loading and unloading procedures, handling high center of gravity, and understanding outage requirements are evaluated. Additionally, applicants must demonstrate knowledge of emergency response procedures and understanding of how to inspect tank vehicles for safety issues.

Yes, drivers with a CDL Tank endorsement must follow specific rules. They must not drive a tank vehicle unless it's empty if they lack the endorsement. This also applies to tanks that were previously used to transport hazardous materials unless purged of any residue. Additionally, drivers must comply with all federal and state regulations regarding the transport of hazardous materials.

No, a valid Commercial Driver's License (CDL) with a Tank endorsement is required to transport liquid or gaseous materials in a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1,000 gallons or more. Driving such vehicles without the proper endorsement is against federal and state law in Alabama.

You can add the CDL Tank endorsement to your current commercial driver's license. It is not necessary to apply for a new license. However, you will need to pass the Tank Vehicle test, and there may be additional fees involved. Always check with your local DMV for specific requirements and procedures.

Yes, handling hazardous materials requires a Hazardous Materials (HazMat) endorsement in addition to the CDL Tank endorsement. To obtain a HazMat endorsement, you must pass a written test and a Transportation Security Administration background check. It's essential to understand and comply with these regulations for safety and legal reasons.